This post is to detail a phenomenon in Mississippi electoral politics: ticket splitting among the Choctaw population in the state. I had noticed this awhile back while looking at old precinct results but never got around to doing a full analysis. Mississippi has a small native population ---- 0.6% as of the latest Census. The highest concentration of the native population in Mississippi is in Neshoba County about 1.5 hours NE of Jackson. According to the latest data from Dave's Redistricting, Neshoba County has 3 precincts with a heavy native-majority (85%+) which gives you a fairly good idea of how this group votes.
Mississippi is famously or perhaps infamously inelastic. Whites and blacks make up nearly all of the voting population and vote overwhelmingly for the Republican Party (in the case of whites) and or for the Democratic Party (in the case of blacks). Precincts where another race is a majority is exceedingly rare. This makes places like Choctaw reservations in Neshoba County or even Little Saigon in East Biloxi --- where Vietnamese migrants make up a substantial % but not quite a majority --- intriguing.
2000
The 2000 election isn't archived in OpenElections (i.e. no tabular/csv) but it is on Internet Archive. You can find those results here. We can find what we need from the 3 heavily-Choctaw precincts and then subtracting those from the Neshoba total as a comparison. I have attached presidential, Senate, and House results from Neshoba County with totals from Choctaw and non-Choctaw precincts. Then the split between the result at the top of the ticket vs. downballot.
(note rounding if any results look 0.01% off)
So, Gore won Choctaw precincts in Neshoba by 20 points but Democratic candidates at the congressional level lost by 40-50 points. Gore was 60-70 points ahead of Democrats that were running in congressional elections which indicates an unusually high level of ticket splitting. As you see, it far exceeds the ticket splitting margin in non-Choctaw Neshoba precincts, the 3rd district as a whole, and Mississippi statewide. Democratic presidential candidates winning Choctaw precincts while congressional Democratic candidates losing or significantly underperforming in these same precincts will be a theme here.
2004
No analysis for 2004. There wasn't a race at the Senate level and the House race was uncontested by Democrats.
2008
More of the same. Obama won the Choctaw precincts by 50 points while the Democratic candidate for Senate Albert Gore (not that one) only won these same precincts by 12.6 points. A 37.4 point gap. The ballot splitting in Neshoba County outside of the 3 precincts highlighted was almost nothing ---- the margin gap between the presidential race and Senate race was 0.01% (!). Statewide, Gore was just over 5 points behind Obama. Wicker ran 15 points behind McCain in Choctaw precincts in the 2008 special election but was almost 40 points ahead of Romney in 2012 after developing some seniority in the Senate.
Conclusion
Mississippi Choctaws tend to favor Democrats at the presidential level. However, entrenched incumbents (which in Mississippi are almost always Republicans) downballot historically overperform at an unprecedented rate. Generally, these communities split their ballots at a comparable level to the rest of the state and county in races involving Republicans with little or no seniority. My working theory on this is that incumbent politicians in Congress have the ability to work on tribal issues which wins the support of some Choctaw voters that prioritize this strongly. However, that is more of just a guess and other factors could very well be at play here.